Renesas HZU12A1LTRF-E

Overview

HZU12A1LTRF-E from Renesas Electronics is a silicon epitaxial planar Zener diode optimized for hard-knee, low-noise voltage reference applications, with nominal Zener voltage 12 V (V_Z = 11.4–12.6 V at I_Z = 0.5 mA), dynamic resistance Z_ZT = 380 Ω (typ.), and ultra-low noise voltage (~1/3–1/10 of standard HZU series). It operates in surface-mount URP (Ultra small Resin Package) and is used in precision analog front-ends and low-drift reference circuits.

For engineers reviewing the HZU12A1LTRF-E datasheet, HZU12A1LTRF-E pinout, HZU12A1LTRF-E application, or HZU12A1LTRF-E equivalent, key selection criteria include its semi-logarithmic V_Z–I_Z linearity (1 nA to 1 mA), temperature coefficient γ_Z = −0.04 mV/°C (typ.), and low-power dissipation (P_d = 150 mW) in compact SC-76A footprint.

Technical Context

The HZU12A1LTRF-E implements a hard-knee Zener breakdown structure with epitaxial planar junction design, enabling stable reverse conduction onset and minimal knee curvature. Its V_Z–I_Z characteristic follows semi-logarithmic linearity across six decades (1 nA–1 mA), supporting accurate low-current biasing and noise-sensitive referencing.

Temperature stability is enhanced via reduced thermal coefficient (γ_Z ≈ −0.04 mV/°C), approximately half that of legacy HZU-series diodes. The device is rated for T_j = 150°C maximum and operates within −55°C to +150°C storage range, suitable for industrial ambient conditions.

Key Specifications

Pinout & Package

Package: Ultra small Resin Package (URP), JEITA code SC-76A, Renesas code PTSP0002ZA-A, mass 0.004 g. Dimensions: 1.70 mm × 0.80 mm × 0.45 mm (L × W × H), cathode-marked top-side marking.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener reference applications.

Compared with BZX84-C12LT1G and MMSZ4687T1G, the HZU12A1LTRF-E delivers uniquely low noise and hard-knee behavior with confirmed semi-log linearity down to 1 nA-making it the only option among the three qualified for precision analog reference and sensor excitation where thermal drift and microampere-level bias fidelity are critical.

Availability

HZU12A1LTRF-E is available at Aetrix Electronics and suitable for high-precision reference supply, low-noise audio biasing, and industrial sensor excitation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for HZU12A1LTRF-E includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Renesas Electronics Corporation is a global semiconductor manufacturer specializing in microcontrollers, analog, power, and timing solutions for industrial, automotive, and infrastructure markets.

The HZU-LL Series was designed specifically for low-noise, hard-knee Zener reference applications demanding superior V_Z–I_Z linearity and reduced temperature drift in ultra-compact surface-mount packages.

FAQ

What is the nominal Zener voltage of the HZU12A1LTRF-E and how is it tested?

The HZU12A1LTRF-E has a nominal Zener voltage of 12 V, with a guaranteed range of 11.4 V to 12.6 V measured at I_Z = 0.5 mA using DC test conditions per REJ03G1216-0500 Rev.5.00. This specification ensures consistent reference level establishment in low-current bias networks where precision matters more than high-power regulation.

Does the HZU12A1LTRF-E support operation at very low reverse currents?

Yes, the HZU12A1LTRF-E exhibits semi-logarithmic V_Z–I_Z linearity from I_Z = 1 nA up to 1 mA, as confirmed in its electrical characteristics table and Fig.1 of the datasheet. This allows reliable use in ultra-low-power reference designs such as energy-harvesting sensors and battery-backed memory keep-alive circuits where bias current must remain below 100 nA.

How does the temperature coefficient of the HZU12A1LTRF-E compare to standard Zener diodes?

The HZU12A1LTRF-E achieves a typical temperature coefficient γ_Z of −0.04 mV/°C, approximately half that of the legacy HZU series and significantly better than generic 12 V Zeners (often −1.0 to −2.0 mV/°C). This results in <0.7 mV total drift over −40°C to +85°C, making it suitable for industrial-grade analog systems without external compensation.

What package type is used for the HZU12A1LTRF-E and what are its key mechanical dimensions?

The HZU12A1LTRF-E uses the Ultra small Resin Package (URP), JEITA code SC-76A, with dimensions 1.70 mm × 0.80 mm × 0.45 mm (L × W × H) and mass 0.004 g. Its compact size and surface-mount compatibility make it ideal for space-constrained PCB layouts in portable instrumentation and wearable health monitors.

Is the HZU12A1LTRF-E suitable for low-noise analog signal chains?

Yes-the HZU12A1LTRF-E is explicitly characterized for low-noise operation, with noise voltage approximately 1/3 to 1/10 that of the standard HZU series. This makes the HZU12A1LTRF-E appropriate for high-fidelity audio preamplifiers, precision data acquisition front-ends, and sensor signal conditioning where reference-induced noise directly impacts system SNR.